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"With the recent conformation of Einstein’s gravitational-waves showing us that the whole Universe is humming; we can now begin to appreciate that every star, every planet, every continent, every building, every person is vibrating along to the same cosmic tune. It turns out that gravitational waves are more like sound waves in music - so in a way, what’s just been observed for the first time is the song of the universe. The relationship between mathematics and music is well known, and with hindsight it has become clear that mathematics and musical instruments exist because matter is a …